The Mercedes-Benz GLC 450d 4MATIC, introduced in November 2023 as part of the X254 generation, represents a significant offering in the mid-size luxury SUV segment. This variant combines a potent diesel engine with mild hybrid technology and a sophisticated all-wheel-drive system, positioned as a premium option within the GLC lineup. It builds upon the foundation of the W254 platform, offering a blend of performance, efficiency, and luxury features aimed at discerning buyers. The 450d trim sits near the top of the non-AMG GLC range, offering a step up in power and refinement compared to the lower-spec models like the GLC 220d and 300d.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | GLC |
| Generation | GLC SUV (X254) |
| Type | GLC 450d (367 Hp) Mild Hybrid 4MATIC 9G-TRONIC |
| Start of production | November, 2023 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Combined fuel consumption (WLTP) | 6.3-7 l/100 km (37.3 – 33.6 US mpg, 44.8 – 40.4 UK mpg, 15.9 – 14.3 km/l) |
| CO2 emissions (WLTP) | 166-185 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 4.7 sec |
| Acceleration 0 – 62 mph | 4.7 sec |
| Acceleration 0 – 60 mph | 4.5 sec |
| Maximum speed | 250 km/h (155.34 mph) |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 5.5 kg/Hp, 183 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 374.1 Nm/tonne |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Electric motor power | 23 Hp |
| Electric motor Torque | 205 Nm (151.2 lb.-ft.) |
| Electric motor location | Between the combustion engine and the transmission |
| Power | 367 Hp @ 4000 rpm |
| Torque | 750 Nm @ 1350-2800 rpm (553.17 lb.-ft. @ 1350-2800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 656.830 |
| Engine displacement | 2989 cm3 (182.4 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Compression ratio | 15.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | BiTurbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 8.5 l (8.98 US qt | 7.48 UK qt) |
| Kerb Weight | 2005 kg (4420.27 lbs.) |
| Max. weight | 2620 kg (5776.11 lbs.) |
| Max load | 615 kg (1355.84 lbs.) |
| Trunk (boot) space – minimum | 620 l (21.9 cu. ft.) |
| Trunk (boot) space – maximum | 1680 l (59.33 cu. ft.) |
| Fuel tank capacity | 62 l (16.38 US gal | 13.64 UK gal) |
| AdBlue tank | 24 l (6.34 US gal | 5.28 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 2500 kg (5511.56 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 100 kg (220.46 lbs.) |
| Length | 4716 mm (185.67 in.) |
| Width | 1890 mm (74.41 in.) |
| Width including mirrors | 2075 mm (81.69 in.) |
| Height | 1640 mm (64.57 in.) |
| Wheelbase | 2888 mm (113.7 in.) |
| Front track | 1627 mm (64.06 in.) |
| Rear (Back) track | 1640 mm (64.57 in.) |
| Front overhang | 843 mm (33.19 in.) |
| Rear overhang | 985 mm (38.78 in.) |
| Ride height (ground clearance) | 174-194 mm (6.85 – 7.64 in.) |
| Minimum turning circle (turning diameter) | 10.9 m (35.76 ft.) |
| Drivetrain Architecture | ICE and electric motor drive all four wheels, operating in mixed mode. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
| Front suspension | Independent multi-link suspension, Air Suspension – Optional |
| Rear suspension | Independent multi-link suspension, Air Suspension – Optional |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
Powertrain & Engine Architecture
The heart of the GLC 450d is the OM 656.830, a 3.0-liter inline-six cylinder diesel engine. This engine is a modern design featuring a bi-turbocharger setup with variable geometry turbines, an intercooler, and a high-pressure common rail fuel injection system. The engine produces 367 horsepower at 4000 rpm and a substantial 750 Nm (553 lb-ft) of torque between 1350 and 2800 rpm. The mild hybrid system utilizes a 48-volt electrical architecture and integrates a 23 hp electric motor between the engine and the 9G-TRONIC automatic transmission. This system allows for functions like extended coasting, smoother start/stop operation, and a small boost in power during acceleration. The 9G-TRONIC transmission is a nine-speed automatic known for its smooth shifts and wide gear ratio spread, contributing to both fuel efficiency and performance.
Driving Characteristics
The GLC 450d delivers a refined and powerful driving experience. The combination of the high-torque diesel engine and the 9G-TRONIC transmission provides effortless acceleration, with a 0-60 mph time of around 4.5 seconds. The mild hybrid system enhances responsiveness and contributes to a more seamless driving feel. Compared to the lower-powered GLC 220d, the 450d offers significantly more performance, particularly during overtaking maneuvers. While not as sporty as the AMG-tuned GLC models, the 450d provides ample power for most driving situations. The 4MATIC all-wheel-drive system ensures excellent traction and stability in various weather conditions.
Equipment & Trim Levels
The GLC 450d typically comes well-equipped with standard features including Mercedes-Benz’s MBUX infotainment system with a large touchscreen display, premium upholstery (often leather), heated front seats, a panoramic sunroof, and a suite of advanced driver-assistance systems. Optional extras include air suspension, upgraded audio systems, and various interior trim packages. The interior design emphasizes luxury and technology, with high-quality materials and a modern aesthetic.
Chassis & Braking
The X254 GLC features a sophisticated chassis design with independent multi-link suspension at both the front and rear. Air suspension is available as an option, providing adjustable ride height and improved comfort. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. Standard safety features include ABS, electronic stability control, and a range of driver-assistance systems such as lane keeping assist and automatic emergency braking.
Market Reception & Comparison
The GLC 450d has been generally well-received by automotive critics, praised for its powerful engine, refined ride, and luxurious interior. Compared to the GLC 300d, the 450d offers a noticeable performance upgrade, justifying its higher price point for buyers prioritizing power. Fuel economy is respectable for a vehicle of its size and performance, with combined WLTP figures ranging from 6.3 to 7.0 l/100km. Reliability appears to be on par with other Mercedes-Benz models, although long-term data is still emerging due to the relatively recent launch of the X254 generation.
Legacy
The OM 656 engine family, used in the GLC 450d, is considered a robust and technologically advanced diesel engine. The integration of mild hybrid technology demonstrates Mercedes-Benz’s commitment to improving fuel efficiency and reducing emissions. The GLC 450d is expected to hold its value well in the used car market, appealing to buyers seeking a luxurious and capable mid-size SUV with a strong powertrain. Its combination of performance, efficiency, and technology positions it as a compelling option in the premium SUV segment.
